Sit or lie down immediately
Raise your legs if possible
Loosen tight clothing
Breathe slowly and deeply
Drink water
Eat something if you have not eaten recently
Move to a cooler place
Avoid standing up quickly
Tense and release your leg muscles
Get fresh air
Rest until you feel fully steady
Avoid alcohol and drugs
Seek medical help if you keep fainting or have chest pain, trouble breathing, severe headache, or confusion